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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd67d3e32d33426a4b7dd2c7eab58048e31252d7cc3297f46ea9628e7c48aaa5' 
  AND token = '8souv/yyqBv5tTQlHWcYdbwAkJejX6FYIw+i0XUr3f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}